Current Density and ZnO Precipitation‐Dissolution Distributions in Zn ‐ ZnO Porous Electrodes and Their Effect on Material Redistribution: A Two‐Dimensional Mathematical Model

A two‐dimensional mathematical model of the porous electrode has been developed. The model calculates electrode and electrolyte potentials, current density distribution, electrolyte concentrations, and Zn and distributions. The primary assumptions are a uniform‐composition counterelectrode, a constant potential along the boundary separating the electrode from the counterelectrode, no convective flow, and an infinite electronic‐matrix conductivity. The model predicts movement of the active material from the center of the electrode toward the edge of the electrode.